Event monitors are used to record heart rate and rhythms for brief periods. They help doctors diagnose problems that don’t happen often enough for an EKG or Holter monitor to record. The monitor may be worn up to 30 days.

Event monitors work only when a person turns on the device. When you experience symptoms, you activate the device and make a recording of your heart’s electrical activity. Because there are different models of event monitors, they can be worn like a wristwatch, carried in your purse or pocket, or worn like a beeper.